BMO is on his way to Mars when a cute extraterrestrial nicknamed "Olive" knocks his spaceship off course, causing a crash landing on a mysterious space station. Upon realizing this strange place is in peril, self-appointed Sheriff BMO enlists Y5, a curious rabbit friend, to help save the day. Will teamwork prevail, or will the powers that be foil this adorable duo's good deeds?

Marceline and Princess Bubblegum journey to the imposing, beautiful Glass Kingdom — and deep into their tumultuous past — to prevent an earthshaking catastrophe.

Peppermint Butler starts over at the beginning as just another inexperienced Wizard School student. Mysterious events on campus cast suspicion on Pep and his checkered past; can he master the mystic arts in time to prove he's innocent?

Finn and Jake are reunited to rediscover their brotherly bond and embark on the most important adventure of their lives.